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(No Model.)

A. WEBER,

DENTAL BNG-INE.

No. 354,819. Patented Deo. 21, 1886.

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PATENT AUGUST VEBER, OF NEW YORK, N. Y.

DENTAL ENGINE..

v SPECIFICATION forming part of Letters Patent No.354,819, dated December 21, 1886.

Application filed April 19, 1886. Serial No. 199,320. (No model.)

A an Improvement in DentalEngines, of which p the end of which is the hand-piece.

the following is a specification.

In dental engines it is usual to employ a revolving iie'Xible shaft within a tubular case, at

In consequence of the curvature given to the flexible shafty while actuating the hand-piece, the flexible shaft within the case is subject to more or less endwise tension, which is disadvantageous, because it tends to bind thesaid flexible shaft more or less against the interior surface of the tubular case. p

My improvement is made for insuring greater freedom in the rotation of the flexible shaft Within the case and for simplifying the con: struction, and at the same time I provide for retaining the belt upon the pulley of the flexible shaft, when said ilexible shaft and its case are allowed to hang in a vertical position when not in use.

In the drawings, Figure l is a vertical section of the upper part of the standard and of the pulley anda portion of the flexible shaft. Fig. 2 is an elevation ofthe parts in the position they assume when the flexible shaft is hanging vertically, and Fig. 3 is a similar elevation at right angles to Fig. 2.

The tubular standard l is supported in any ordinary manner, and at the upper end thereof is the pulley-head 2, from the lower end of which the jointed pivot-rod 8 projects downwardly into the upper end of the tubular standard 1. This pivot-rod 3 allows the pulley-head 2 and the iiexible shalt and case that are connected to the same to swivel at the top of the tubular standard and swing around horizontally.

The knuckle or rule joint in the pivotrod 3 in its ordinary position is within' the upper end of the tubularl standard l; but when the pulley-head and pivotrod are raised and the joint elevated above the tubular standard the parts can swing on the joint ofthe pivot-rod and the flexible shaft hang vertically, so as not to become bent or set in any direction when not in use. This jointed pivot-rod, however, is not my invention, the same having been used by Dr. Delois Palmer in New York for many years. When the flexible shaft is allowed to hang vertically, the belt 4 isliable to slip off the pulley 5. I have thereforeI yis turned upon the jointed pivotrod and the shaft hangs ina vertical position the belt 4 is retained upon the pulley`5 by the belt-guide 6.

The pulley 5 is upon a tubular spindle, 8, that passes through the pulley-head 2 and revolves freely in the bearings upon such pulley-head, and by making the pulley lit tightly i upon the tubular spindle the parts are easilyk connected by driving theftubular spindle into the pulley after thelatter has been placed between the bearings of the pulley-head.l

ter; but upon the end thereof a prismatic rod, 11, is securely fastened, and the tubular spindle '8 is sufficiently large to allow the prismatic rod to slide freely therein, and at one end of the said tubular spindle 8 the hole is made square or prismatic to receive the rod l1. By this construction the prismatic rod at the end of the flexible shaft can slide backward and forward freely lWithin the tubular spindle, and the prismatic rod and flexible shaft will be rotated by the tubular spindle and pulley, thus preventing the iieXible shaft becoming bound or rubbing forcibly against the interior of the ilexible case.

The ileXible cover or case l5 is of ordinary construction. It is fastened into the tubular shield 16, and this in turn is screwed upon a cylindrical projection at one end of thepulley-head 2. This shield 16 has sufficient leverageto turn the pulley-head upon the jointed pivot-rod Without Aany risk of injuring the iieXible case at its j unctiou with the tubuler shield, thus rendering the end of the-flexible case more durable than heretofore.

I claim as my iuventionl. The combination, with the pulley and its head, of a tubular standard, a cylindrical pivotrod fitting into the tubular standard and on which the pulley-head-can swivel, a joint in suchl pivot-rod that allows the pulleyhead to be swung down when the pivot-rod is raised to bring the joint above the tubular standard, and a guide at the base of the head 7o The flexible shaft l0 is of ordinary characf IOO . the pulley-head, the flexible case connected at of thetubulai` shield, attached at one end to I the other end of the tubular shield, exble 5 shaft passing through the shield and case, and the prisrnatie rod attached to the flexible shaft and passing into the axis of the pulley, substantially asspecifed.

Signed by me this 16th day of April, A. D.

' AUGUST WEBER.

Witnesses:

GEO. T. PINCKNEY, WILLIAM G. MoTT. 

